Darnell and Nicholas are comparing the international calling plans on their cell phones. On his plan, Darnell pays $1 just to place a call and $3 for each minute. When Nicholas makes an international call, he pays $5 to place the call and $1 for each minute. A call of a certain duration would cost exactly the same under both plans. What is the duration?

answer: on graphs, the open and closed circles, or vertical asymptotes drawn as dashed lines us identify discontinuities.

as before, graphs and tables allow us to estimate at best.

when working with formulas, getting zero in the denominator indicates a point of discontinuity.

when working with piecewise-defined functions, check for discontinuities at the transition points where one piece ends and the next begins.

step-by-step explanation:

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step-by-step explanation:

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